Function send 

pub fn send(
    ctx: &Ctx,
    email: Email,
) -> impl Future<Output = Result<()>> + Send + use<>

Sends email now, from MAIL_FROM, with the adapter named by MAIL_ADAPTER.

log prints the whole email to the Worker console between LOG_PREFIX lines and sends nothing; resend makes one POST https://api.resend.com/emails subrequest; cloudflare calls the EMAIL_BINDING send_email binding. The request waits for the provider; use deliver_later to answer first and retry failures.

The returned future is Send, so axum handlers can await it.

Free-plan limits (September 2026): Resend sends 100 emails a day and 3,000 a month from one domain, to any recipient; Cloudflare Email Service on Workers Free only delivers to verified destination addresses of the account.

Errors

• Error::BadRequest (400): a recipient (to, cc, bcc) or reply_to is not an email address.
• Error::Internal (500), with a log message naming the fix: MAIL_ADAPTER unset or unknown; MAIL_FROM unset or not an address; a subject that is empty or spans several lines; the RESEND_API_KEY secret or the EMAIL: bindings.sendEmail() binding missing; the provider refused the email (e.g. Resend’s quota reached, an unverified domain or recipient) or could not be reached.

Examples

use axum::extract::State;
use ocre::mail::Email;
use ocre::{Ctx, Result};

async fn invite(State(ctx): State<Ctx>) -> Result<&'static str> {
    let email = Email::new("ada@example.com", "You're invited", "Join us: https://example.com/join");
    ocre::mail::send(&ctx, email).await?;
    Ok("invited")
}